Buck Converters

A Buck Converter, also known as a Step-Down Converter, is a DC-to-DC power converter that steps down the voltage from its input to its output. A buck converter integrates the core components and circuitry needed into a single device.

Buck converters are found in countless electronic applications, where their power regulation properties are a vital component.

How does a Buck Converter work?

A Buck Converter is a type of switch-mode power supply, a class of device that incorporates a switch (e.g. typically a MOSFET) to rapidly turn the circuit on and off. This rapid switching creates a square wave. If the duty cycle of the switch is set to 50%, i.e. the switch is on 50% of the time, the average voltage will be 50% of the input.

The square wave needs to be smoothed to provide useful power, typically an inductor and capacitor are used in series to fulfil this function. This combination is called an LC low pass filter. The properties of an inductor smooth the current flow, while the capacitor resists sudden changes in voltage. The combined effect produces a relatively smooth voltage output with low ripple. For example, if the input voltage is 10V and the switch employs a duty cycle of 50%, the output voltage will be 5V.

A further necessary component of a Buck Converter is to incorporate a diode or other switch in parallel with the inductor. This is to compensate for the property of an inductor, in that the current in an inductor cannot instantly change, protecting the switching transistor from being overloaded and destroyed.

Buck Converters also incorporate additional circuitry to ensure a stable output voltage. The converter uses a closed-loop control scheme with negative feedback to monitor the voltage output and dynamically adjusts the duty cycle of the switch to regulate the output voltage.

Design considerations

  • Buck Converters are very efficient, with some devices offering efficiencies of above 95%.
  • Buck Converters can be more cost-effective than linear regulators at higher power levels, the cost of removing the heat generated by a linear regulator may be less than employing a Buck Converter.
  • The output of a Buck Converter will feature a noise, meaning the more stable output of a linear voltage regulator is better suited for application requiring low output noise.
  • Linear regulators can respond faster to input and output changes versus a buck converter.

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รายละเอียดสินค้า / Description ราคา / Price Maximum Output Current Maximum Output Voltage Regulator Function Minimum Output Voltage Minimum Input Voltage Maximum Input Voltage Output Type Mounting Type Series Number of Outputs Pin Count Package Type Switching Regulator Line Regulation
RS Stock No. 146-5626
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK304PN
THB23.846
Each (In a Tube of 50)
Units
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS Stock No. 146-5618
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK302PN
THB21.336
Each (In a Tube of 50)
Units
80mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS Stock No. 423-579
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LTC3419EMS#PBF
THB148.56
Each
Units
600mA - Buck Controller - 2.5 V 5.5 V Adjustable Surface Mount - 2 10 MSOP Yes 0.5 %/V
RS Stock No. 884-2593
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LT1172CQ#PBF
THB263.42
Each: (In a Pack of 2)
Units
5A 65 V Standard - 3 V 60 V - Surface Mount - 1 5 DD Yes 0.03 %/V
RS Stock No. 920-3674
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-ADJ/NOPB
THB114.237
Each (In a Tube of 95)
Units
1A 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 533-5058
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-ADJ/NOPB
THB211.89
Each
Units
1A 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 463-050
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576T-ADJG
THB65.964
Each: (In a Pack of 5)
Units
3A 37 V Buck Controller, Inverting 1.23 V 7 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS Stock No. 100-7567
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576T-ADJG
THB55.22
Each (In a Tube of 50)
Units
3A 37 V Buck Controller, Inverting 1.23 V 7 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS Stock No. 533-5042
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-5.0/NOPB
THB152.39
Each
Units
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS Stock No. 920-3665
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-5.0/NOPB
THB139.332
Each (In a Tube of 95)
Units
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS Stock No. 545-7811
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PTN78000WAH
THB503.95
Each
Units
1.5A - Buck Controller - - - - Through Hole - 1 5 DIP Module Yes ±10
RS Stock No. 906-3353
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LTM4624EY#PBF
THB441.38
Each
Units
4A 5.5 V Step Down 0.6 V 4 V 14 V Adjustable Surface Mount - 1 25 BGA Yes 0.15 %/V
RS Stock No. 121-8927
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PTN78000WAH
THB499.225
Each (In a Tube of 56)
Units
1.5A - Buck Controller - - - - Through Hole - 1 5 DIP Module Yes ±10
RS Stock No. 533-3232
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576S-ADJ/NOPB
THB102.79
Each
Units
3A 37 V Buck Controller, Inverting 1.23 V 4 V 40 V Adjustable Surface Mount - 1 6 D2PAK (TO-263) Yes -
RS Stock No. 533-8091
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576T-5.0/NOPB
THB91.93
Each
Units
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS Stock No. 545-5045
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LT1076CT#PBF
THB273.36
Each
Units
10A 50 V Buck Controller 2.5 V 7.3 V 45 V Adjustable Through Hole - 1 5 TO-220 Yes 0.02 %/V
RS Stock No. 920-3514
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576S-ADJ/NOPB
THB84.56
Each (In a Tube of 45)
Units
3A 37 V Buck Controller, Inverting 1.23 V 4 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS Stock No. 380-034
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L5973D
THB90.688
Each: (In a Pack of 5)
Units
2A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS Stock No. 127-0676
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4960
THB125.34
Each
Units
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 7 HEPTAWATT V Yes 50 mV
RS Stock No. 786-2391
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2596TVADJG
THB73.102
Each: (In a Pack of 5)
Units
3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -